<?php
if (!isset($target)) {
  echo '$target variable unset!';
  return;
}
?>

<a class="toggle">show</a>
刷新:<input type="text" name="refresh" size="3" />
行数:<input type="text" name="line" size="3" />
<?php echo $target?>
<a class="toggle">hide</a>
<input type="hidden" name="target" value="<?php echo $target; ?>" />
<div class="frame-div">

</div>